Washington State Route 18
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SR 18 is highlighted in red.
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| Route information | ||||
| Defined by RCW 47.17.075 | ||||
| Maintained by WSDOT | ||||
| Length: | 28.41 mi (45.72 km) | |||
| Existed: | 1964 – present | |||
| Major junctions | ||||
| West end: |
 SR 99 in Federal Way
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 I‑5 in Federal Way SR 167 in Auburn SR 516 in Covington SR 169 in Maple Valley
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| East end: |
 I‑90 near North Bend
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| Location | ||||
| Counties: | King | |||
| Highway system | ||||
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State Route 18 (SR 18) is a 28.41-mile-long (45.72 km) state highway in the U.S. state of Washington, serving southeastern King County. The highway travels northeast, primarily as a controlled-access freeway, from an intersection with SR 99 and an interchange with Interstate 5 (I-5) in Federal Way through the cities of Auburn, Kent, Covington, and Maple Valley. SR 18 becomes a two-lane rural highway near Tiger Mountain as it approaches its eastern terminus, an interchange with I-90 near the cities of Snoqualmie and North Bend.
SR 18 was established during the 1964 state highway renumbering as the successor to the Auburn–Federal Way branch of Primary State Highway 5 (PSH 5) and the Auburn–North Bend branch of PSH 2, which were created in 1931 and 1949, respectively. The initial two-lane highway, named the Echo Lake Cutoff, was completed in December 1964 after the opening of a section around Tiger Mountain, which would later be the site of over 170 accidents in the 1980s. SR 18 was gradually widened into a four-lane freeway beginning in Auburn in 1992 and most recently finishing in Federal Way in 2007. The highway around Tiger Mountain and near the I-90 interchange remains a two-lane road, with a funded project planned to re-build the existing interchange with I-90.
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